<template>
  <view>
    <view class="search-box">
      <!-- 使用 uni-ui 提供的搜索组件 -->
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17"@click="clean"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item, i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
         kw: '',
         // 搜索结果列表
         searchResults: [],
         //搜索历史的数组
         historyList: ['a', 'app', 'apple']
      };
    },
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      //input输入事件的处理数
      input(e) {
          // console.log(e)
          
          clearTimeout(this.timer)
          
          this.timer = setTimeout(() => {
              // console.log(e)
              this.kw = e
              this.getSearchList()
            }, 500)
        },
        async getSearchList(){
         // 判断关键词是否为空
        if (this.kw.length === 0) {
             this.searchResults = []
             return
           }
           const { data: res } = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw })
           if (res.meta.status !== 200) return uni.$showMsg()
           this.searchResults = res.message
           
           this.saveSearchHistory()
       },
       gotoDetail(item){
         console.log(item.goods_id)
         uni.navigateTo({
             url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
           })
       },
       saveSearchHistory() {
         // this.historyList.push(this.kw)
         
         const set = new Set(this.historyList)
         set.delete(this.kw)
         set.add(this.kw)
         this.historyList = Array.from(set)
         
         //对搜索历史数据进行持久化存储
          uni.setStorageSync('kw', JSON.stringify(this.historyList))
       },
       clean() {
         this.historyList = []
         uni.setStorageSync('kw', '[]')
       },
       gotoGoodsList(kw) {
         uni.navigateTo({
           url: '/subpkg/goods_list/goods_list?query=' + kw
         })
       }
    },
    computed: {
      histories(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}

.sugg-list {
  padding: 0 5px;

  .sugg-item {
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: space-between;

    .goods-name {
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}

.history-box {
  padding: 0 5px;

  .history-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }

  .history-list {
    display: flex;
    flex-wrap: wrap;

    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
